Products Description
Nitrided Manganese Metal Lump is a high-performance alloying material widely used in the steelmaking and foundry industries. By introducing nitrogen into manganese metal, this product combines the benefits of both elements, enhancing strength, toughness, and wear resistance in steel. It is particularly valued for its ability to act as a nitrogen additive, deoxidizer, and alloying agent, improving the mechanical properties and stability of special steels, stainless steels, and construction steels.
Specification
Typical chemical composition of Nitrided Manganese Metal Lump (for reference, can be adjusted based on customer requirements):
Mn: 85–95%
N: 2.0–8.0%
C: ≤1.0%
Si: ≤2.0%
Fe: Balance
Note: Customized specifications are available depending on application needs.
How is Nitrided Manganese Metal Lump Manufactured?
The manufacturing process involves high-temperature nitriding of manganese metal in a controlled environment. During production:
High-purity manganese metal is selected as the raw material.
The material is placed into a nitriding furnace under a controlled flow of nitrogen gas.
Through high-temperature reaction, nitrogen is absorbed into the manganese lattice, forming a stable nitrogen-rich alloy.
The product is then cooled, crushed, and sized into standard lumps for industrial use.
This process ensures a uniform nitrogen content and consistent metallurgical performance.
What is the Standard Size Range of Nitrided Manganese Lump?
Nitrided Manganese Metal Lump is usually supplied in the following size ranges:
10–50 mm
10–100 mm
Customized sizes available upon request.
Well-graded particle size ensures easy handling, good melting performance, and efficient absorption in steelmaking.
How to Ensure Consistent Quality in Nitrided Manganese Lump?
To guarantee product stability and reliability, the following measures are applied:
Strict Raw Material Selection – Only high-purity manganese metal is used.
Advanced Nitriding Technology – Controlled furnace conditions for precise nitrogen absorption.
Comprehensive Quality Testing – Chemical composition analysis, size inspection, and batch certification.
Standardized Packaging & Storage – Preventing contamination and moisture absorption during transport.
International Certifications – Compliance with ISO and industry-specific standards.
By combining advanced technology with rigorous quality control, manufacturers ensure consistent performance, stable nitrogen content, and high customer satisfaction.
Case Study
Optimizing Nitrogen Control in High-Strength Low-Alloy (HSLA) Steel Production
1. Client Profile
Industry: Specialty Steel Manufacturing
Location: South Korea
Product Focus: High-strength low-alloy (HSLA) steel plates for shipbuilding and offshore wind structures.
Challenge: Achieving consistent nitrogen (N) content (150–250 ppm) without degrading ductility or causing porosity in the final cast product.
2. The Problem: Inefficient Nitrogen Addition
The client traditionally used standard medium-carbon ferromanganese (FeMn) combined with nitrogen-rich manganese nitride (Mn₃N₂) powder injected via a wire feeder. This process led to three major issues:
Low Recovery Rate: Only 55–60% of nitrogen was absorbed due to powder buoyancy and oxidation loss.
Inconsistent Alloying: Nitrogen levels fluctuated between 120–280 ppm, causing rejected heats.
Hydrogen Pickup: The powder binder introduced hydrogen into the melt, requiring costly vacuum degassing.
The client needed a denser, purer nitrogen carrier with predictable dissolution kinetics.
3. The Solution: High Quality Nitrided Manganese Lump
The supplier introduced a High Quality Nitrided Manganese Lump with the following specifications:
| Parameter | Typical Value |
|---|---|
| Mn Content | 85–90% |
| N Content | 6–8% (uniformly distributed) |
| C | ≤0.10% |
| Si | ≤0.50% |
| P / S | ≤0.03% each |
| Size | 20–50 mm (lumpy, low porosity) |
| Density | ~6.8 g/cm³ |
Key advantages:
High bulk density allowed direct addition to the ladle or furnace, avoiding wire feeding.
Uniform nitriding through a controlled solid-state diffusion process (not simple coating).
Low hydrogen & oxygen content due to high-temperature vacuum nitriding.
4. Implementation Process
Trial Phase: 10 heats of 150 tons each.
Addition Method: Added directly to the ladle during tapping (after deoxidation with Al) at 1580–1620°C.
Recovery Calculation: Pre-melt and post-melt sampling for N analysis (LECO combustion method).
5. Results & Data
After switching to High Quality Nitrided Manganese Lump, the client documented the following improvements over a 3-month production period (50 heats):
| Performance Metric | Previous Method (Powder/Wire) | New Nitrided Mn Lump | Improvement |
|---|---|---|---|
| N Recovery Rate | 55–60% | 88–92% | +30% |
| N Stability (Std Dev) | ±35 ppm | ±8 ppm | 4x more consistent |
| Yield Strength (HSLA) | 480 MPa (variable) | 515 MPa (stable) | +7% |
| Degassing Time | 25 min (H removal) | 12 min | 50% faster |
| Rejected Heats (N out of spec) | 12% | 1.5% | -87.5% |
Microstructure analysis showed fine, dispersed nitrides (no grain boundary precipitation), improving toughness at -40°C by 15 J (Charpy impact).
6. Economic Impact (per 1,000 tons of steel)
Reduced alloy cost: Less Manganese needed (higher recovery) → saved $28/ton.
Faster cycle time: 13 minutes saved per heat → increased production capacity by 8%.
Lower reject rate: saved $12,000 per 1,000 tons in rework and scrap.
Total estimated savings: ~$55,000 per 1,000 tons of HSLA steel.
7. Conclusion
The switch to High Quality Nitrided Manganese Lump transformed the client's nitrogen alloying process from an unreliable, post-cast repair step into a precise, cost-effective ladle metallurgy operation. The dense lump form eliminated hydrogen risk, doubled recovery efficiency, and enabled stable production of high-strength steel grades meeting API and DNV standards.
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